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      034.配置Telnet远程管理网络设备
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        <h4 id="Telnet-概述"><a href="#Telnet-概述" class="headerlink" title="Telnet 概述"></a>Telnet 概述</h4><p>​        Telnet 是TCP/IP 协议族中的一种远程登陆协议，在数通设备中 Telnet 服务是默认开启的。在数通设备中开启 Telnet 服务并进行必要的配置后，就可以远程登陆到路由器或者交换机管理该设备。</p>
<a id="more"></a>

<h4 id="Telnet-和-SSH-的异同"><a href="#Telnet-和-SSH-的异同" class="headerlink" title="Telnet 和 SSH 的异同"></a>Telnet 和 SSH 的异同</h4><p>​        SSH 和 Telnet 一样，都是TCP/IP 协议族中的远程登陆协议。</p>
<p>他们之间的异同点在于：</p>
<ol>
<li><p>Telnet 是明文传输协议；SSH是加密传输协议，传输的数据是经过压缩的，更节省资源。</p>
</li>
<li><p>Telnet 的默认端口号为 23；SSH的默认端口号为22。</p>
</li>
<li><p>Telnet 没有使用公钥验证用户身份；SSH 使用公钥对访问的服务器的用户验证身份，进一步提高了安全性。</p>
<p>​        因为 Telnet 的安全性不如SSH，但在数通设备中 Telnet 服务通常是默认开启，方便。所以Telnet 常用于本地网络环境。而SSH 安全性更高，经过公网的登陆环境还是使用 SSH 服务登陆更优。</p>
</li>
</ol>
<h4 id="命令行用户访问等级"><a href="#命令行用户访问等级" class="headerlink" title="命令行用户访问等级"></a>命令行用户访问等级</h4><p>​        系统将命令进行分级管理，以增加设备的安全性。设备管理员可以设置用户级别，不同级别的用户可以使用对应级别的命令。</p>
<p>命令级别分为0～3级，用户级别分为0～15级。</p>
<ol>
<li>用户 0 级为访问级别<ul>
<li>对应网络诊断工具命令（ping、tracert）</li>
<li>从本设备出发访问外部设备的命令（Telnet 客户端）</li>
<li>部分 display 命令等。</li>
</ul>
</li>
<li>用户 1 级为监控级别<ul>
<li>包括用于系统维护的命令以及 display 等命令</li>
</ul>
</li>
<li>用户 2 级为配置级别<ul>
<li>向用户提供直接网络服务，包括路由、各个网络层次的命令</li>
</ul>
</li>
<li>用户 3～15 级为管理级别<ul>
<li>主要是用于系统运行的命令，对业务提供支撑作用，包括文件系统，FTP、TFTP下载、文件交换配置、电源供应控制，备份板控制、用户管理、命令级别设置、系统内部参数设置以及用于业务故障诊断的 debugging 命令。</li>
</ul>
</li>
</ol>
<h4 id="配置-Telnet-并实现远程登陆"><a href="#配置-Telnet-并实现远程登陆" class="headerlink" title="配置 Telnet 并实现远程登陆"></a>配置 Telnet 并实现远程登陆</h4><p>一、搭建一个简单的直连网络：</p>
<p><img src="/image/034/034-20200528234250.png" alt=""></p>
<p>R1：</p>
<div class="highlight-box"autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false" contenteditable="true"data-rel="SHELL"><figure class="iseeu highlight /shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">&lt;R1&gt;system-view 	#进入系统视图</span><br><span class="line">[R1]interface GigabitEthernet 0/0/0		#进入接口视图</span><br><span class="line">[R1-GigabitEthernet0/0/0]ip address 12.1.1.1 24		#配置IP地址</span><br></pre></td></tr></table></figure></div>

<p>R2：</p>
<div class="highlight-box"autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false" contenteditable="true"data-rel="SHELL"><figure class="iseeu highlight /shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line">&lt;R2&gt;system-view 	#进入系统视图</span><br><span class="line">[R2]interface GigabitEthernet 0/0/0		#进入接口视图</span><br><span class="line">[R2-GigabitEthernet0/0/0]ip address 12.1.1.2 24		#配置IP地址</span><br><span class="line">[R2-GigabitEthernet0/0/0]ping 12.1.1.1		#Ping一下，看有没有连通</span><br><span class="line">  PING 12.1.1.1: 56  data bytes, press CTRL_C to break</span><br><span class="line">    Reply from 12.1.1.1: bytes=56 Sequence=1 ttl=255 time=40 ms</span><br><span class="line">    Reply from 12.1.1.1: bytes=56 Sequence=2 ttl=255 time=30 ms</span><br><span class="line">    Reply from 12.1.1.1: bytes=56 Sequence=3 ttl=255 time=40 ms</span><br><span class="line">    Reply from 12.1.1.1: bytes=56 Sequence=4 ttl=255 time=30 ms</span><br><span class="line">    Reply from 12.1.1.1: bytes=56 Sequence=5 ttl=255 time=50 ms</span><br><span class="line"></span><br><span class="line">  --- 12.1.1.1 ping statistics ---</span><br><span class="line">    5 packet(s) transmitted</span><br><span class="line">    5 packet(s) received</span><br><span class="line">    0.00% packet loss</span><br><span class="line">    round-trip min/avg/max = 30/38/50 ms</span><br></pre></td></tr></table></figure></div>



<p>二、设置远程登陆密码并授权</p>
<p>R1：</p>
<div class="highlight-box"autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false" contenteditable="true"data-rel="SHELL"><figure class="iseeu highlight /shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">[R1]user-interface vty 0 3		#不同设备连接的vty(虚拟终端接口)不一样；0是初始值，3是结束值。表示可同时打开4个会话配置命令，并且使用的配置都是一样的。</span><br><span class="line">[R1-ui-vty0-3]set authentication password cipher huawei		#设置登陆密码为显示加密的huawei。注意不同版本的VRP配置可能会稍有不同</span><br><span class="line">[R1-ui-vty0-3]user privilege level 15		#设置登陆用户的权限，默认为权限0,该权限不允许用户登陆到系统视图，此处配置为最高级别——15级</span><br></pre></td></tr></table></figure></div>



<p>三、测试，从R2通过网络远程登陆到R1配置下系统时钟</p>
<p>R2：</p>
<div class="highlight-box"autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false" contenteditable="true"data-rel="SHELL"><figure class="iseeu highlight /shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line">&lt;R2&gt;telnet 12.1.1.1</span><br><span class="line">Trying 12.1.1.1 ...</span><br><span class="line">Press CTRL+K to abort</span><br><span class="line">Connected to 12.1.1.1 ...</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">Login authentication</span><br><span class="line"></span><br><span class="line"></span><br><span class="line">Password:</span><br><span class="line">Info: The max number of VTY users is 10, and the number</span><br><span class="line">      of current VTY users on line is 1.</span><br><span class="line">      The current login time is 2020-05-29 00:11:29.</span><br><span class="line">&lt;R1&gt;clock timezone BJ add 8		#修改时区为北京+8区</span><br><span class="line">&lt;R1&gt;clock datetime 17:02:10 2020-5-29		#设置时间日期，注意时间格式</span><br><span class="line">&lt;R1&gt;display clock		#展示下时钟，验证是否配置成功</span><br><span class="line">2020-05-29 17:02:16+08:00</span><br><span class="line">Friday</span><br><span class="line">Time Zone(BJ) : UTC+08:00</span><br></pre></td></tr></table></figure></div>



<blockquote>
<p>2020年5月30日 完结</p>
</blockquote>
<hr>
<p>参考：《华为HCNA认证详解与学习指南》周亚军 等编著。</p>

      
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